Interesting stuff. Not sure how useful it is, but certainly interesting. https://www.youtube.com/watch?v=h_mKlz6blfQ
Its training for extra mental capacity. That way you can be 1,2 or 3 moves ahead of the guy throwing punches at you.
The grid of numbers is called Schulte table, it's used for visual perception training. Helps with peripheral vision, reflexes and ****.
